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BORROWINGS - Long term (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
BORROWINGS |  |
Long-term, current portion | $ 107,461 | $ 718,034
Long-term, current portion | 63,590 | 61,623
Subtotal for long-term | 317,582 | 353,985
Long-term borrowings from non-banking institutions | 76,032 | 50,356
Long-term borrowings from non-banking institutions | $ 76,032 | $ 50,356
Average interest rate on long-term borrowings (as a percent) | 2.50% | 3.06%
Future principal repayment on the long-term borrowings loans |  |
2018 | $ 436,821 |
2019 | 62,255 |
2020 | 120,477 |
2021 | 48,444 |
2022 | 5,970 |
Thereafter | 156,468 |
Total | 830,435 |
Less: future principal repayment related to long-term borrowings, current portion | (436,821) |
Total long-term portion | 393,614 | $ 404,341
Borrowings secured by project assets |  |
BORROWINGS |  |
Long-term, current portion | 208,755 | 131,562
Long-term, current portion | 57,015 | 205,873
Borrowings unsecured by project assets |  |
BORROWINGS |  |
Long-term, current portion |  | 11,358
Borrowings on project assets |  |
BORROWINGS |  |
Long-term, current portion | $ 265,770 | $ 348,793
Average interest rate on long-term borrowings (as a percent) | 4.59% | 2.22%
Unsecured |  |
BORROWINGS |  |
Long-term borrowings from non-banking institutions | $ 10,409 | $ 50,356
Future principal repayment on the long-term borrowings loans |  |
Total long-term portion | 97,237 | 87,852
Borrowings secured by project assets and solar power systems |  |
BORROWINGS |  |
Long-term borrowings from non-banking institutions | 65,623 |
Future principal repayment on the long-term borrowings loans |  |
Total long-term portion | 161,628 | 24,640
Borrowings secured by property, plant and equipment |  |
Future principal repayment on the long-term borrowings loans |  |
Total long-term portion | 32,863 | 83,329
Borrowings secured by equity |  |
Future principal repayment on the long-term borrowings loans |  |
Total long-term portion |  | 150,000
Borrowings secured by restricted cash |  |
Future principal repayment on the long-term borrowings loans |  |
Total long-term portion | 12,483 |
Borrowings secured by accounts receivable |  |
Future principal repayment on the long-term borrowings loans |  |
Total long-term portion | 8,361 |
Borrowings secured by inventories |  |
Future principal repayment on the long-term borrowings loans |  |
Total long-term portion | $ 5,010 | $ 8,164

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